Let’s just say it’s a multiple but not even close to 625k. I guess you have to consider other aspects of the start up too? Based on the info provided your “friend” should probably ask for 30-50% more equity.

Equity around 0.1% seems reasonable for a series B company given the years of experience. At the end of the day, it depends on how desperately they want to hire your friend. Given that first few employees have disproportionate impact on the company, they might be willing to give more equity.